Merge pull request #1198 from kiwix/Issue#157-scroll-tab-buttons

Introduce Scroll Buttons to Replace Ones from Qt's Built-in TabBar.

resources/css/style.css

@@ -167,7 +167,9 @@ QTabBar {
 }
 
 QTabBar::tear {
-     background-color: blue;
+    width: 0px;
+    height: 0px;
+    border: none;
 }
 
 QTabWidget::pane {
@@ -194,19 +196,33 @@ QTabBar::tab:first {
     padding-left: 5px;
 }
 
-QTabBar::tab:last QToolButton {
+#closeTabButton, #newTabButton {
     font-size: 30px;
     width: 30px; min-width: 30px; max-width: 30px;
     height: 30px; min-height:30px; max-height:30px;
     border-radius: 3px;
 }
 
-QTabBar::tab:last QToolButton::hover {
+#nextTabButton, #prevTabButton, #newTabSideButton {
+    border: 1px solid #ccc;
+}
+
+#closeTabButton:hover, #newTabButton:hover,
+#nextTabButton:hover, #prevTabButton:hover,
+#newTabSideButton:hover {
     border: 1px solid #3366CC;
     background-color: #D9E9FF;
     border-radius: 3px;
 }
 
+QTabBar::scroller {
+    width: 0px;
+    height: 0px;
+    
+    /* Last tab size is off by 1 if border not set. */
+    border: 1px solid transparent;
+}
+
 /* -----------------------------------------
     TabWidget
 */

resources/i18n/en.json

@@ -165,5 +165,7 @@
     "import-reading-list": "Import reading list",
     "import-reading-list-error": "An error has occured during import of the reading list.",
     "disable-sandbox": "Application was launched from a network drive. This is known to cause compatibility issues due to the sandbox. Do you want to take the risks and disable it?",
-    "save-page-as": "Save As..."
+    "save-page-as": "Save As...",
+    "scroll-next-tab": "Scroll to next tab",
+    "scroll-previous-tab": "Scroll to previous tab"
 }

resources/i18n/qqq.json

@@ -172,5 +172,7 @@
 	"export-reading-list-error": "Error description text for when exporting the reading list to a file failed.",
 	"import-reading-list": "Represents the action of importing a reading list from a file.",
 	"import-reading-list-error": "Error description text for when importing a reading list from a file failed.",
-	"save-page-as": "Represents the action of saving the current tab content to a file chosen by the user."
+	"save-page-as": "Represents the action of saving the current tab content to a file chosen by the user.",
+	"scroll-next-tab": "Represents the action of scrolling to the next tab of the current tab which toward the end of the tab bar.",
+	"scroll-previous-tab": "Represents the action of scrolling to the previous tab of the current tab which toward the start of the tab bar."
 }

resources/icons/caret-left-solid.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 256 512"><!--!Font Awesome Free 6.6.0 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free Copyright 2024 Fonticons, Inc.--><path d="M9.4 278.6c-12.5-12.5-12.5-32.8 0-45.3l128-128c9.2-9.2 22.9-11.9 34.9-6.9s19.8 16.6 19.8 29.6l0 256c0 12.9-7.8 24.6-19.8 29.6s-25.7 2.2-34.9-6.9l-128-128z"/></svg>

resources/kiwix.qrc

@@ -65,5 +65,6 @@
         <file>icons/xmark-solid.svg</file>
         <file>icons/home-button.svg</file>
         <file>icons/more-vertical.svg</file>
+        <file>icons/caret-left-solid.svg</file>
     </qresource>
 </RCC>

src/kiwixapp.cpp

@@ -385,16 +385,16 @@ void KiwixApp::createActions()
 
     if (QGuiApplication::isLeftToRight()) {
       CREATE_ACTION_ICON_SHORTCUT(HistoryBackAction, "history-left", gt("back"), QKeySequence(Qt::ALT | Qt::Key_Left));
+      CREATE_ACTION_ICON_SHORTCUT(HistoryForwardAction, "history-right", gt("forward"), QKeySequence(Qt::ALT | Qt::Key_Right));
+      CREATE_ACTION_ICON(ScrollNextTabAction, "caret-right-solid", gt("scroll-next-tab"));
+      CREATE_ACTION_ICON(ScrollPreviousTabAction, "caret-left-solid", gt("scroll-previous-tab"));
     } else {
       CREATE_ACTION_ICON_SHORTCUT(HistoryBackAction, "history-right", gt("back"), QKeySequence(Qt::ALT | Qt::Key_Right));
+      CREATE_ACTION_ICON_SHORTCUT(HistoryForwardAction, "history-left", gt("forward"), QKeySequence(Qt::ALT | Qt::Key_Left));
+      CREATE_ACTION_ICON(ScrollNextTabAction, "caret-left-solid", gt("scroll-next-tab"));
+      CREATE_ACTION_ICON(ScrollPreviousTabAction, "caret-right-solid", gt("scroll-previous-tab"));
     }
     DISABLE_ACTION(HistoryBackAction);
-
-    if (QGuiApplication::isLeftToRight()) {
-      CREATE_ACTION_ICON_SHORTCUT(HistoryForwardAction, "history-right", gt("forward"), QKeySequence(Qt::ALT | Qt::Key_Right));
-    } else {
-      CREATE_ACTION_ICON_SHORTCUT(HistoryForwardAction, "history-left", gt("forward"), QKeySequence(Qt::ALT | Qt::Key_Left));
-    }
     DISABLE_ACTION(HistoryForwardAction);
 
     CREATE_ACTION_ICON_SHORTCUT(PrintAction, "print", gt("print"), QKeySequence::Print);

src/kiwixapp.h

@@ -64,6 +64,8 @@ public:
         ExitAction,
         ExportReadingListAction,
         ImportReadingListAction,
+        ScrollPreviousTabAction,
+        ScrollNextTabAction,
         MAX_ACTION
     };
 

src/mainwindow.cpp

@@ -27,6 +27,18 @@ MainWindow::MainWindow(QWidget *parent) :
     addAction(app->getAction(KiwixApp::NextTabAction));
     addAction(app->getAction(KiwixApp::PreviousTabAction));
 
+    mp_ui->newTabSideButton->setDefaultAction(app->getAction(KiwixApp::NewTabAction));
+    mp_ui->nextTabButton->setDefaultAction(app->getAction(KiwixApp::ScrollNextTabAction));
+    mp_ui->prevTabButton->setDefaultAction(app->getAction(KiwixApp::ScrollPreviousTabAction));
+
+    connect(mp_ui->tabBar, &TabBar::sizeChanged, this, &MainWindow::updateTabButtons);
+    connect(mp_ui->tabBar, &QTabBar::currentChanged, this, &MainWindow::updateTabButtons);
+    connect(mp_ui->tabBar, &TabBar::tabRemovedSignal, this, &MainWindow::updateTabButtons);
+    connect(mp_ui->tabBar, &TabBar::tabInsertedSignal, this, &MainWindow::updateTabButtons);
+
+    connect(mp_ui->nextTabButton, &QToolButton::triggered, mp_ui->tabBar, &TabBar::scrollNextTab);
+    connect(mp_ui->prevTabButton, &QToolButton::triggered, mp_ui->tabBar, &TabBar::scrollPreviousTab);
+
     connect(app->getAction(KiwixApp::ExitAction), &QAction::triggered,
             this, &QMainWindow::close);
     connect(app->getAction(KiwixApp::ToggleFullscreenAction), &QAction::triggered,
@@ -102,6 +114,32 @@ void MainWindow::showTabAndTop() {
     getTopWidget()->show();
 }
 
+void MainWindow::updateTabButtons()
+{
+    auto tabBar = getTabBar();
+    QRect tabBarRect = getTabBar()->rect();
+    QRect newTabButtonRect = tabBar->tabRect(tabBar->count() - 1);
+
+    /* Decision is made at half way of the new button tab for smoothness */
+    newTabButtonRect.setWidth(newTabButtonRect.width() / 2);
+    bool newTabButtonVisible = tabBarRect.contains(newTabButtonRect);
+    mp_ui->newTabSideButton->setHidden(newTabButtonVisible);
+
+    int lastTabIndex = tabBar->realTabCount() - 1;
+    QRect firstTabRect = tabBar->tabRect(0);
+    QRect lastTabRect = tabBar->tabRect(lastTabIndex);
+
+    bool firstVisible = tabBarRect.contains(firstTabRect);
+    bool lastVisible = tabBarRect.contains(lastTabRect);
+    bool noOverFlow = firstVisible && lastVisible;
+
+    mp_ui->prevTabButton->setHidden(noOverFlow);
+    mp_ui->nextTabButton->setHidden(noOverFlow);
+
+    mp_ui->prevTabButton->setDisabled(tabBar->currentIndex() == 0);
+    mp_ui->nextTabButton->setDisabled(tabBar->currentIndex() == lastTabIndex);
+}
+
 bool MainWindow::eventFilter(QObject* /*object*/, QEvent* event)
 {
     if (event->type() == QEvent::MouseMove && isFullScreen())
@@ -129,6 +167,7 @@ void MainWindow::resizeEvent(QResizeEvent *event)
 {
     QMainWindow::resizeEvent(event);
     KiwixApp::instance()->getContentManager()->getView()->updateSizeHint();
+    updateTabButtons();
 }
 
 void MainWindow::readingListToggled(bool state)

src/mainwindow.h

@@ -37,6 +37,7 @@ private slots:
     void readingListToggled(bool state);
     void hideTabAndTop();
     void showTabAndTop();
+    void updateTabButtons();
 
 private:
     Ui::MainWindow *mp_ui;

src/tabbar.cpp

@@ -104,6 +104,7 @@ void TabBar::setContentManagerView(ContentManagerView* view)
 void TabBar::setNewTabButton(QAction* newTabAction)
 {
     QToolButton *tb = new QToolButton();
+    tb->setObjectName("newTabButton");
     tb->setDefaultAction(newTabAction);
     tb->setIcon(QIcon(":/icons/new-tab-icon.svg"));
     int idx = addTab("");
@@ -133,11 +134,24 @@ void TabBar::moveToPreviousTab()
     setCurrentIndex(index <= 0 ? realTabCount() - 1 : index - 1);
 }
 
+void TabBar::scrollNextTab()
+{
+    const int index = currentIndex();
+    setCurrentIndex(index == realTabCount() - 1 ? index : index + 1);
+}
+
+void TabBar::scrollPreviousTab()
+{
+    const int index = currentIndex();
+    setCurrentIndex(index <= 0 ? index : index - 1);
+}
+
 void TabBar::setCloseTabButton(int index)
 {
     Q_ASSERT(index > 0 && index < realTabCount());
 
     QToolButton *tb = new QToolButton(this);
+    tb->setObjectName("closeTabButton");
     QAction *a = new QAction(QIcon(":/icons/close.svg"), gt("close-tab"), tb);
     a->setToolTip(getAction(KiwixApp::CloseCurrentTabAction)->toolTip());
     tb->setDefaultAction(a);
@@ -238,7 +252,7 @@ QSize TabBar::tabSizeHint(int index) const
 {
     QWidget *w = mp_stackedWidget->widget(index);
 
-    if (w && qobject_cast<ContentManagerView*>(w))
+    if ((w && qobject_cast<ContentManagerView*>(w)) || index >= count() - 1)
         return QSize(40, 40); // the "Library" tab is only icon
 
     return QSize(205, 40); // "Settings" and content tabs have text
@@ -491,6 +505,24 @@ void TabBar::paintEvent(QPaintEvent *e)
     }
 }
 
+void TabBar::tabRemoved(int index)
+{
+    QTabBar::tabRemoved(index);
+    emit tabRemovedSignal(index);
+}
+
+void TabBar::tabInserted(int index)
+{
+    QTabBar::tabInserted(index);
+    emit tabInsertedSignal(index);
+}
+
+void TabBar::resizeEvent(QResizeEvent *event)
+{
+    QTabBar::resizeEvent(event);
+    emit sizeChanged();
+}
+
 void TabBar::onTabMoved(int from, int to)
 {
     // avoid infinitive recursion

src/tabbar.h

@@ -52,14 +52,24 @@ public:
     QStringList getTabUrls() const;
     QStringList getTabZimIds() const;
 
+    // The "+" (new tab) button is implemented as a tab (that is always placed at the end).
+    // This function returns the count of real tabs.
+    int realTabCount() const;
+
 protected:
     void mousePressEvent(QMouseEvent *event);
     void paintEvent(QPaintEvent *);
+    void tabRemoved(int index) override;
+    void tabInserted(int index) override;
+    void resizeEvent(QResizeEvent *) override;
 
 signals:
     void webActionEnabledChanged(QWebEnginePage::WebAction action, bool enabled);
     void tabDisplayed(TabType tabType);
     void currentTitleChanged(const QString& title);
+    void tabRemovedSignal(int index);
+    void tabInsertedSignal(int index);
+    void sizeChanged();
 
 public slots:
     void closeTab(int index);
@@ -69,6 +79,8 @@ public slots:
     void on_webview_titleChanged(const QString& title);
     void moveToNextTab();
     void moveToPreviousTab();
+    void scrollNextTab();
+    void scrollPreviousTab();
 
 private:
     void setCloseTabButton(int index);
@@ -77,10 +89,6 @@ private:
     QStackedWidget*     mp_stackedWidget;
     QScopedPointer<FullScreenWindow> m_fullScreenWindow;
 
-    // The "+" (new tab) button is implemented as a tab (that is always placed at the end).
-    // This function returns the count of real tabs.
-    int realTabCount() const;
-
 private slots:
     void onTabMoved(int from, int to);
     void onCurrentChanged(int index);

ui/mainwindow.ui

@@ -6,7 +6,7 @@
    <rect>
     <x>0</x>
     <y>0</y>
-    <width>1024</width>
+    <width>968</width>
     <height>576</height>
    </rect>
   </property>
@@ -40,13 +40,83 @@
      <number>0</number>
     </property>
     <item>
-     <widget class="TabBar" name="tabBar" native="true"/>
+     <layout class="QVBoxLayout" name="verticalLayout_3">
-    </item>
-    <item>
-     <layout class="QHBoxLayout" name="horizontalLayout">
       <property name="spacing">
        <number>0</number>
       </property>
+      <item>
+       <layout class="QHBoxLayout" name="tabBarLayout">
+        <property name="spacing">
+         <number>0</number>
+        </property>
+        <item>
+         <widget class="QToolButton" name="prevTabButton">
+          <property name="maximumSize">
+           <size>
+            <width>40</width>
+            <height>40</height>
+           </size>
+          </property>
+          <property name="text">
+           <string/>
+          </property>
+          <property name="iconSize">
+           <size>
+            <width>24</width>
+            <height>24</height>
+           </size>
+          </property>
+         </widget>
+        </item>
+        <item>
+         <widget class="TabBar" name="tabBar" native="true"/>
+        </item>
+        <item>
+         <widget class="QToolButton" name="newTabSideButton">
+          <property name="maximumSize">
+           <size>
+            <width>40</width>
+            <height>40</height>
+           </size>
+          </property>
+          <property name="text">
+           <string/>
+          </property>
+          <property name="icon">
+           <iconset resource="../resources/kiwix.qrc">
+            <normaloff>:/icons/new-tab-icon.svg</normaloff>:/icons/new-tab-icon.svg</iconset>
+          </property>
+          <property name="iconSize">
+           <size>
+            <width>16</width>
+            <height>16</height>
+           </size>
+          </property>
+         </widget>
+        </item>
+        <item>
+         <widget class="QToolButton" name="nextTabButton">
+          <property name="maximumSize">
+           <size>
+            <width>40</width>
+            <height>40</height>
+           </size>
+          </property>
+          <property name="text">
+           <string/>
+          </property>
+          <property name="iconSize">
+           <size>
+            <width>24</width>
+            <height>24</height>
+           </size>
+          </property>
+         </widget>
+        </item>
+       </layout>
+      </item>
+      <item>
+       <layout class="QHBoxLayout" name="horizontalLayout">
         <item>
          <widget class="QStackedWidget" name="sideBar">
           <property name="enabled">
@@ -88,6 +158,8 @@
        </layout>
       </item>
      </layout>
+    </item>
+   </layout>
   </widget>
   <widget class="TopWidget" name="mainToolBar">
    <property name="movable">
@@ -130,6 +202,8 @@
    <container>1</container>
   </customwidget>
  </customwidgets>
- <resources/>
+ <resources>
+  <include location="../resources/kiwix.qrc"/>
+ </resources>
  <connections/>
 </ui>